CN215064761U

CN215064761U - Liquid level meter based on transmission and reflection characteristics of signal in variable impedance medium

Info

Publication number: CN215064761U
Application number: CN202121145787.2U
Authority: CN
Inventors: 付俊; 常伟; 戴煊龙
Original assignee: Polymer Suzhou Sensing Technology Co ltd
Current assignee: Polymer Suzhou Sensing Technology Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-12-07
Anticipated expiration: 2031-05-26

Abstract

The utility model relates to a level instrument technical field specifically is a level gauge based on signal transmission reflection characteristics in variable impedance medium, including the circuit board, the periphery cladding of circuit board has insulating encapsulation, and the signal generation module and signal acquisition module have set firmly on the circuit board and lie in insulating encapsulation, and signal generation module electricity is connected with test induction electrode, and signal acquisition module electricity is connected with liquid induction electrode, and insulating encapsulation cladding test induction electrode, liquid induction electrode run through and stretch out insulating encapsulation. The utility model discloses utilize the principle that signal transmission and reflection characteristic can change when the medium impedance changes to carry out the measurement of liquid level, the implementation of liquid level measurement scheme is simple and easy, and insulating encapsulation maintains that test response electrode shape is vertical and keep apart with the external world, and the step signal direction that makes the signal generation module send is vertical downwards, improves the measuring result precision.

Description

Liquid level meter based on transmission and reflection characteristics of signal in variable impedance medium

Technical Field

The utility model relates to a level meter technical field specifically is a level gauge based on signal transmission reflection characteristics in the variable impedance medium.

Background

The liquid level measurement has wide application in daily life and industrial production, such as water tanks and water towers, water tanks of solar water heaters, water tanks of electric water heaters, sewer pipe networks, chemical industry and other industrial production liquid reaction tanks.

The existing common liquid level measuring methods mainly include ultrasonic liquid level measurement, pressure transmission sensing liquid level, floater/floating ball liquid level measurement and capacitance transmission sensing liquid level. The ultrasonic liquid level measurement is high in cost and needs to be installed in a spacious space environment; the pressure sensing liquid level has higher requirements on water quality, sediment or scale deposits are easy to be misaligned or even damaged, and in addition, the pressure sensing liquid level has certain requirements on the sealing property because the pressure sensing liquid level is generally arranged at the bottom of a water tank; the contact carbon film of the float-type liquid level meter can be worn along with the service time, and is not suitable for conductive liquid such as water, and the mechanical switch of the float-type liquid level meter has certain requirements on the manufacturing process, and has a complex structure, and the number of measurement points is limited to a certain extent; the capacitance sensing liquid level has higher requirement on water quality and is greatly influenced by the blockage of silt and water scale.

In view of the above, the research and development of a liquid level meter which is simple in operation, high in precision and good in universality has great technical significance and economic significance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a level gauge based on signal transmission reflection characteristics in the variable impedance medium to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a level gauge based on signal transmission reflection characteristics in variable impedance medium, includes the circuit board, the periphery cladding of circuit board has insulating encapsulation, just be located on the circuit board insulating encapsulation sets firmly signal generation module and signal acquisition module, signal generation module electricity is connected with test response electrode, signal acquisition module electricity is connected with liquid response electrode, insulating encapsulation cladding test response electrode, liquid response electrode runs through and stretches out insulating encapsulation, signal generation module sends step signal to on the test response electrode, the signal acquisition module is gathered stack signal on the liquid response electrode.

Optionally, a microcontroller is fixedly arranged on the circuit board, the output end of the microcontroller is electrically connected with the input end of the signal generation module, the input end of the microcontroller is electrically connected with the output end of the signal acquisition module, the input end of the microcontroller is electrically connected with a transmission line for transmitting current and signals, and the transmission line penetrates through and extends out of the insulation package.

Optionally, a counterweight is fixedly arranged on the insulating package, a floating plate is fixedly arranged on the insulating package, the floating plate floats on the liquid level, and the test induction electrode and the liquid induction electrode are in a vertical state.

Optionally, the counter weight is plumb shape, the kickboard is ring shape, the lower surface of kickboard just is located a protection section of thick bamboo has set firmly in the periphery of test response electrode and liquid response electrode, the bottom of a protection section of thick bamboo all is less than the bottom of test response electrode and the bottom of liquid response electrode.

Optionally, the top end of the insulating package is integrally formed with a receiving member, and the receiving member is in a flange shape.

Optionally, the surface of the liquid sensing electrode is coated with a polytetrafluoroethylene anti-scaling coating, and a waterproof sealant is coated at the joint of the liquid sensing electrode and the insulating package.

Compared with the prior art, the utility model provides a level gauge based on signal transmission reflection characteristic in the variable impedance medium possesses following beneficial effect:

1. the utility model utilizes the principle that the transmission and reflection characteristics of signals can change when the medium impedance changes to measure the liquid level, the implementation of the liquid level measuring scheme is simple and easy, the insulating packaging maintains the vertical shape of the test sensing electrode and isolates the electrode from the outside, the direction of a step signal sent by a signal generating module is vertical and downward, and the precision of the measuring result is improved;

2. the utility model discloses a counter weight and kickboard maintain the level gauge balanced for test response electrode and liquid response electrode can be in vertical state all the time in liquid, improve the precision of testing result, and surround test response electrode and liquid response electrode through the protection section of thick bamboo, prevent that test response electrode and liquid response electrode are crooked.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure: 1. a circuit board; 2. insulating and packaging; 3. a signal generating module; 4. a signal acquisition module; 5. testing the induction electrode; 6. a liquid sensing electrode; 7. a microcontroller; 8. a transmission line; 9. balancing weight; 10. a floating plate; 11. a protective cylinder; 12. a bearing member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: please refer to fig. 1, the utility model provides a level gauge based on signal transmission reflection characteristic in impedance-varying medium, including circuit board 1, the periphery cladding of circuit board 1 has insulating encapsulation 2, insulating encapsulation 2 adopts the PVC material to make, it has signal generation module 3 and signal acquisition module 4 to just be located welding in insulating encapsulation 2 on the circuit board 1, 3 electricity of signal generation module are connected with test induction electrode 5, signal acquisition module 4 electricity is connected with

liquid induction electrode

6, 2 cladding test induction electrode 5 of insulating encapsulation, liquid induction electrode 6 runs through and stretches out insulating encapsulation 2, signal generation module 3 sends step signal to test induction electrode 5 on, the stack signal on the liquid induction electrode 6 is gathered to signal acquisition module 4.

The top end of the insulating packaging part 2 is integrally formed with a bearing part 12, and the bearing part 12 is in a flange disc shape and is used for being fixed with an external mounting structure through bolts and providing a fulcrum for mounting the liquid level meter.

The welding has microcontroller 7 on the circuit board 1, and microcontroller 7's output electricity is connected the input of signal generation module 3, and microcontroller 7's input electricity is connected the output of signal acquisition module 4, and microcontroller 7's input electricity is connected with the transmission line 8 of transmission current and signal, and transmission line 8 runs through and stretches out insulating encapsulation 2. The surface of the liquid induction electrode 6 is coated with a polytetrafluoroethylene anti-scaling coating, and the joint of the liquid induction electrode 6 and the insulating package 2 is coated with waterproof sealant.

Example 2: please refer to fig. 2, the utility model provides a level gauge based on signal transmission reflection characteristic in impedance-varying medium, including circuit board 1, the periphery cladding of circuit board 1 has insulating encapsulation 2, insulating encapsulation 2 adopts the silica gel material to make, it has signal generation module 3 and signal acquisition module 4 to just be located welding in insulating encapsulation 2 on the circuit board 1, 3 electricity of signal generation module are connected with test induction electrode 5, signal acquisition module 4 electricity is connected with

liquid induction electrode

The insulating package 2 is bonded with a balance weight 9, the insulating package 2 is bonded with a floating plate 10, the floating plate 10 is annular, and the balance weight 9 is vertical and is positioned at the center of the floating plate 10. The quality and the position of the balance weight 9 can meet the requirement that the floating plate 10 floats on the liquid level, and under the action of the balance weight 9 and the floating plate 10, the test induction electrode 5 and the liquid induction electrode 6 can be always in a vertical state in liquid, so that the detection result precision is high. The lower surface of kickboard 10 and the periphery that is located test induction electrode 5 and liquid induction electrode 6 have set firmly a protection section of thick bamboo 11, and a protection section of thick bamboo 11 adopts the PVC material to make, and the bottom of a protection section of thick bamboo 11 all is less than the bottom of test induction electrode 5 and the bottom of liquid induction electrode 6, can protect test induction electrode 5 and liquid induction electrode 6 when storage and turnover, prevents that test induction electrode 5 and liquid induction electrode 6 are crooked.

The measurement principle is as follows: the utility model discloses utilize the principle that signal transmission and reflection characteristic can change when the medium impedance changes to carry out the measurement of liquid level. The test induction electrode 5 is isolated from the outside after being coated by the insulation packaging 2, and the insulation packaging 2 maintains the vertical shape of the test induction electrode 5, so that the signal generation module 3 sends a step signal in a downward direction, and the precision of a measurement result is improved. In the measurement, the example 1 and the example 2 were placed in a container to be measured for liquid level.

When no liquid is in the container, namely the test sensing electrode 5 and the liquid sensing electrode 6 are not in contact with the measured medium, the impedance in the cavity below is continuous, the test sensing electrode 5 sends out a step signal, and the liquid sensing electrode 6 receives the step signal.

When liquid exists in the container, namely the liquid induction electrode 6 contacts the measured liquid medium, the impedance change of the cavity below the liquid induction electrode occurs, the peak value of the step signal changes correspondingly, one part of the step signal is reflected back, the other part of the step signal continues to propagate downwards, the reflected signal is superposed on the step signal to form a superposed signal, and the superposed signal is collected by the signal collection module 4. Because the reflected signal and the step signal sent by the signal generation module 3 have a certain time difference, the edge of the superposed signal is stepped, wherein the step distance reflects the time relation of signal propagation and reflection, the step amplitude reflects the dielectric coefficient of the measured liquid, and the impedance value of the impedance discontinuity point in the cavity below can be obtained according to the level amplitude of the step signal sent by the signal generation module 3 and the level amplitude of the superposed signal.

The signal acquisition module 4 transmits the data of the superposed signals to the time domain reflectometer through the transmission line 8, a TDR curve can be displayed on a screen of the time domain reflectometer, the TDR curve and each point of the liquid induction electrode 6 have a one-to-one correspondence relationship, namely, the impedance value and the point distance of each point on the liquid induction electrode 6 can be read from the TDR curve, and if no liquid level exists, the point distances are equal; if the liquid level exists, the point distance changes at the liquid level, and the sum of the changed point distances is the liquid level height.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A liquid level meter based on the transmission and reflection characteristics of signals in a variable impedance medium is characterized in that: including circuit board (1), the periphery cladding of circuit board (1) has insulating encapsulation (2), just be located on circuit board (1) insulating encapsulation (2) internal fixation has signal generation module (3) and signal acquisition module (4), signal generation module (3) electricity is connected with test induction electrode (5), signal acquisition module (4) electricity is connected with liquid induction electrode (6), insulating encapsulation (2) cladding test induction electrode (5), liquid induction electrode (6) run through and stretch out insulating encapsulation (2), signal generation module (3) send step signal extremely on test induction electrode (5), signal acquisition module (4) are gathered superimposed signal on liquid induction electrode (6).

2. The liquid level gauge based on the transmission reflection characteristic of signals in a variable impedance medium according to claim 1, wherein: microcontroller (7) has set firmly on circuit board (1), the output electricity of microcontroller (7) is connected the input of signal generation module (3), the input electricity of microcontroller (7) is connected the output of signal acquisition module (4), the input electricity of microcontroller (7) is connected with transmission line (8) of transmission current and signal, transmission line (8) run through and stretch out insulating encapsulation (2).

3. The liquid level gauge based on the transmission reflection characteristic of signals in a variable impedance medium according to claim 1, wherein: the testing device is characterized in that a balance weight (9) is fixedly arranged on the insulation package (2), a floating plate (10) is fixedly arranged on the insulation package (2), the floating plate (10) floats on the liquid level, and the testing induction electrode (5) and the liquid induction electrode (6) are in a vertical state.

4. A gauge as claimed in claim 3, wherein the gauge is based on the transmission and reflection characteristics of a signal in a variable impedance medium: counter weight (9) are plumb shape, kickboard (10) are ring shape, the lower surface of kickboard (10) just is located the periphery of test response electrode (5) and liquid response electrode (6) has set firmly a protection section of thick bamboo (11), the bottom of a protection section of thick bamboo (11) all is less than the bottom of test response electrode (5) and the bottom of liquid response electrode (6).

5. The liquid level gauge based on the transmission reflection characteristic of signals in a variable impedance medium according to claim 1, wherein: the top end of the insulation package (2) is integrally formed with a bearing piece (12), and the bearing piece (12) is in a flange disc shape.

6. The liquid level gauge based on the transmission reflection characteristic of signals in a variable impedance medium according to claim 1, wherein: the surface of the liquid induction electrode (6) is coated with a polytetrafluoroethylene anti-scaling coating, and the joint of the liquid induction electrode (6) and the insulating package (2) is coated with waterproof sealant.